Cramping form for violin bouts



W. F. BUBLITZ. CRAMFING FORM FOR VIOLIN BOUTS.

Amlcmonfmzn guLv 911921. v

1,415,144. w 1 Patented May 9,1922.

2 SHEETS-SHEET l.

v1,41 5,144, y Patented May 9, 1922.

CRAMPING FORM FOR VIOLIN BOUTS.

APPucAUoN FILED JULY 9. |921.

42 SHEETS-sain z.

pan;-

CRAEWPING 'FORV FOR 'VIOLIN BUTS.

Application. filed .1rly 9,

To @ZZ whom. i may coa-cem.' y

it known that l, VILLniM F. 'linnnrfrn a violin maker, citizen of thellnited States, residing at Elkhorn. in the county of Walworth and State of lWisconsin, have invented certain new and useful improvements 'in @ramping Forms for Violin Bouts, of which the following is a specification, referencehcingr had to the accompanyingdrawings.

This invention relates to what are known in the art as cramping forms, and more particularly to cramping forms used inthe construction of violin, bouts.

In the manufacture of-violins, the bouts or sides, before beingse'cured to the back and belly of the instrument are first formed into proper'shape of three pieces of material which areV glued togetherand subsequently have their reinforcing strips attached to their marginal edges. ln forming these strips, they are preferably ironed .into their approximate shape and then cramped into position in. the gluingform and after becoming set are removed, trimmed up and made ready for the subsequent attachment of the belly and back.

ln previous forms the removal of bouts from the form was made extremely dicult owing to the fact that theexcess'ive glue which oozedl out of the joint between the center rof the bout and the forward or rear bout-s, sometimes called theend bouts, adhered to the mold with such. tenacity as to require insertion of a knife between the. bouts and the mold which frequently caused breaking of the bouts and. often resulted in bad joints which had to be covered up by purliing. This was resorted to in many instances by the old masters. Another serious defect in the old types of molds was that the bouts stuck to the base of the mold the which necessitated the insertion of a knife beneath the bouts and between the saine and -center and end bouts so that the use of purliing to cover up defects may be elimi- Y nated, .and it is of course also the object of the invention to provide a mold into which the bouts may be readily and efliciently cramped and removed when set without the use of any instrument.y i

Further objects of the invention will appear as the followingspecitic description Speccation of Letters Patent. j patinte@ Edguy. 5.), 1;()22

192i. serial no. 483,585.

read in connection with the accompanying drawings which form a part of this appli! cation and vin which: i A L Figure 1 a top'plan view;

lf igure 2 is a side elevation; l

Figure 3 a transverse section taken on the line of Figure 1;

Figure lis a detail section taken on the .line i-41 of Figure 1;

Adigure 5 is .a section taken on the 5-5 of Figure 1. Referring' more particularly to the drawings, 1 represents a bae of wood or any other suitable material which has secured to theupper surface thereof a Zink plate V2, the purpose of which will be hereinafter described. 1

.Secured upon the top of the plate 2 by bolts or lagscrews 8,.which enter the base l. the mold form curredat 5, 6 and "Z to receive the upper, intermediate or center,

line

and lower or tail boutof the violin.y The f curves v5` and "-are both compound as shown, and the curve for the Ycenter bout is substantially one-half of an oval divided upon its longitudinal axis.V rlhe curves 5 and 6 .and 6 and '.7 substantially merge into each other at 8 and 9 to receive the ends of the bouts, and' are slightly separated so as to allow a `passage 10 to receive the ends of the bouts.Y These passages communicate with enlarged openings 11 formed in the mold body 4lwhich are provided to receive and permit removal of any e"cess glue which is squeezed out from between the joining ends of the end bouts and the center bout.

Any excess glue which may rise to the upper edges of the joined ends can be, readily .scraped or washed away before it sets and vany excessive glue which escapes at the lower .edges of the joined ends can be washed or scraped away after removal, it being understood that this excessive glue does not adhere to the Zink. f

Secured to the base 2 at suitable intervals, are blocks 12 having threaded openings therein to receive the cramping screws 13 which carry upon their outer ends the bout engaging headsl. Each of these screws is provided wit-h a handle 15 for forcing the heads into engagementy with the lbouts in a manner which is well known. Each block 12 is preferably provided with an oil hole 16 by f lar groove 18 into which the pin 19, passing through the head, is fitted. This permits of ready rotation of the screw in the head and shape, the center bout has its ends dippedl Y in glue and placed in position around the curve 6. rlhe end or front and tail bouts are then placed in position in the curves 5 and 7, and the screws 15 operated to carry the heads intoY engagement with the bouts. The center screw is preferably operated first to clamp the center bout tightly against the mold 6, and the corner blocks 20, after be ing properly coated with glue, are placed in the corners `between the end bouts and the center bout as shown. The two outer screws are then operated to bring their heads into engagement with the corner blocks, thus forcing the corner blocks into the corner and the ends of the end bouts and center bout into the'passages l0.A In this position the boutsv conform to the curvature oi the mold. The' surplus glue is then washed off the topedges Y- then removed and the surplus glue at. the

bottom edges of the corners is washed 'or scraped away. The sides are then ready for u the attachment of the belly and back.

catingwith the channels, a plurality of up-` right supporting blockslocated on the base,

screws threaded through the blocks and provided at one end with handles, and heads swiveled upon the other ends of the screws for cramping the ends of the bouts into the channels. v v

2. In a gluing form for violin bouts, va base7 a form secured to the base and having channels for the reception of the ends of the bouts to be joined, the mold being further provided with enlarged openings communieating with the channels, a plurality or upright supporting blocks locatedon the base, screws threaded through the blocks and provided'at one end' with; handles, and heads swiveled upon the other ends oi"- vthe screws for cramping the ends of the bouts into the channels, the aXes oi" the screws allconverg-` ing to a point` beyond the base.

In testimony whereofl hereunto aliiX my signature.

wrnLrAM i?. BUBLITZ.vv 

